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Green Manure as Nitrogen Source for Sweet Corn in a Warm–Temperate Environment

^a Univ. of Florida, Inst. of Food and Agric. Sciences, Dep. of Agronomy, Gainesville, FL 32611 (C. M. Cherr current address: Univ. of California, Graduate Group in Ecology and Dep. of Plant Sciences, Davis, CA 95616)
^b Univ. of Florida, Inst. of Food and Agric. Sciences, Dep. of Entomology and Nematology, Gainesville, FL 32611

View larger version (49K): [in a new window]   Fig. 1. Minimum (—) and maximum (—) daily temperatures during growth of green manures, 2001–2002 (A) and 2002–2003 (B); daily solar radiation (rad.), 2001–2002 (C) and 2002–2003 (D). Data provided by Florida Automated Weather Network (2004). Arrows indicate planting (white) and termination (black) of sunn hemp and winter green manure, in order.

View larger version (60K): [in a new window]   Fig. 2. Sunn hemp dry weight (2001–2002, A; 2002–2003, C) and N content (2001–2002, B; 2002–2003, D) during growth and decomposition. In order from the bottom of each graph, patterns represent the following tissue types: = roots, = stems, = leaves, = flowers. Error bars reflect standard error values. Black arrows indicate sunn hemp death.

View larger version (19K): [in a new window]   Fig. 3. Leaf area index (LAI) as function of cumulative GDD for sunn hemp during 2001 () and 2002 (), lupin during 2001–2002 (), and vetch () during 2002–2003. Error bars reflect standard error values. Regression models shown are for both years of sunn hemp together (ySH) and lupin and vetch together (yL). Circled values were not included in regression model for sunn hemp as they represent sample dates at which leaf senescence occurred.

View larger version (41K): [in a new window]   Fig. 4. Lupin and vetch dry weights (lupin, 2001–2002, A; vetch 2002–2003, C) and N contents (lupin, 2001–2002, B; vetch 2002–2003, D) . Patterns and error bars are defined as in Fig. 1.

View larger version (30K): [in a new window]   Fig. 5. Total plant dry weight and N content for green manure crops as functions of time (A and B, respectively) and as functions of cumulative intercepted photosynthetically active radiation (PAR; C and D, respectively). Green manure crops shown are: sunn hemp during 2001 () and 2002 (), lupin during 2001–2002 (), and vetch () during 2002–2003. Error bars reflect standard error values.

View larger version (14K): [in a new window]   Fig. 6. Total N content of green manure materials 1–2 wk prior to planting sweet corn. SH–C = sunn hemp-corn rotation, L–C = winter legume-corn rotation, SH–L–C = sunn hemp–winter legume–corn rotation. Entries in the same year denoted by identical letters are not different to the 0.05 level according to Duncan's Multiple Range Test.